Motor Holding Brake - Siemens SINAMICS G120D Operating Instructions Manual

8.7.4

Motor holding brake

The motor holding brake prevents the motor turning when it is switched off. The converter
has internal logic to optimally control a motor holding brake.
Function after OFF1 and OFF3 command
The inverter controls the motor holding brake in the following way:
● After the ON command (to switch on motor), the inverter magnetizes the motor.
● After the magnetizing time (p0346), the inverter issues the command to open the brake.
● The inverter keeps the motor at a standstill up until the end of the time in p1216. The
● At the end of the brake opening time the motor accelerates to the speed setpoint.
● After the OFF command (OFF1 or OFF3) the motor brakes to a standstill.
● When braking, the inverter compares the speed setpoint and the actual speed with the
● As soon as the first of the two times (p1227 or p1228) has elapsed, the inverter issues
● After the brake closing time p1217, the inverter switches off the motor.
Figure 8-21
Converter with control units CU240D-2
Operating Instructions, 04/2014, FW V4.7, A5E34262100B AA
motor holding brake must open within this time.
speed threshold p1226:
If the speed setpoint falls below the threshold p1226, the inverter starts the time p1227.
If the actual speed falls below the threshold p1226, the inverter starts the time p1228.
the command to close the brake.
The motor comes to a standstill but remains switched on.
The motor holding brake must close within this time.
Controlling the motor holding brake when the motor is switched on and off
Setting functions
8.7 Application-specific functions
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